See also: Point to point, Unicast, Trick Play
CIMM DEFINITION: A service provided by the operator that enables digital subscribers to access programming on channels that can be viewed at the viewers convenience and that have DVR and addressable capability. Video On-Demand content is delivered to the end user at the time of request via multiple platforms such as cable, satellite, IPTV, Internet, Mobile, etc., Sometimes these channels are pay On-Demand and sometimes they are free On-Demand. Content can be streamed either through a Set-Top Box (allowing viewing in real-time) or downloaded to a device such as a computer or DVR (for future viewing).Internet television, accessed online, is an increasingly popular form of VOD.
2: VOD permits a customer to browse an online program or film catalogue, to watch trailers and to then select a recording for playback. The playout of the selected movie starts nearly instantaneously on the customer’s TV or PC. Technically, when the customer selects the movie, a point-to-point unicast connection is set up between the customer’s decoder (Set-Top Box or PC) and the delivering streaming server. The signaling for the trick play functionality (pause, slow-motion, wind / rewind etc.,) is assured by RTSP (Real-time Streaming Protocol). The most common codecs used for VOD are MPEG-2, MPEG-4 and VC-1. In an attempt to avoid content piracy, the VOD content is usually encrypted. Whilst encryption of satellite and cable TV broadcasts is an old practice, with IPTV technology it can effectively be thought of as a form of Digital Rights Management. A film that is chosen, for example, may be playable for 24 hours following payment, after which time it becomes unavailable. (Source: itvt.com/glossary)
3: The ability for a viewer to pro-actively choose and view a piece of video content at their convenience through any video consumption device, including their television. Content is served and viewed upon request. (Source: Nielsen)
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